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Note 27 - Financial Instruments and Risks (Details Textual) - BRL (R$)
R$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Statement Line Items [Line Items]    
Value at risk exposure, probable 95.00%  
Value at risk, duration 21 days  
Value at risk, adverse scenario, deterioration percentage 25.00%  
Value at risk, remote scenario, deterioration percentage 50.00%  
Guarantees held for derivative instruments R$ 653.8 R$ 606.3
Equity swap transaction [member]    
Statement Line Items [Line Items]    
Total gains (losses) on financial assets at fair value through profit or loss (378.2)  
Equity price risk [member]    
Statement Line Items [Line Items]    
Risk exposure associated with instruments sharing characteristic R$ 1,500.0  
Bottom of range [member]    
Statement Line Items [Line Items]    
Trigger clause percentage, credit risk 10.00%  
Top of range [member]    
Statement Line Items [Line Items]    
Trigger clause percentage, credit risk 15.00%